2531381 has 8 divisors (see below), whose sum is σ = 2683800. Its totient is φ = 2383360.

The previous prime is 2531377. The next prime is 2531387. The reversal of 2531381 is 1831352.

It can be written as a sum of positive squares in 4 ways, for example, as 100 + 2531281 = 10^2 + 1591^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2531381 - 2² = 2531377 is a prime.

It is a super-2 number, since 2×2531381² = 12815779534322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125 + ... + 2253.

It is an arithmetic number, because the mean of its divisors is an integer number (335475).

2^2531381 is an apocalyptic number.

It is an amenable number.

2531381 is a deficient number, since it is larger than the sum of its proper divisors (152419).

2531381 is a wasteful number, since it uses less digits than its factorization.

2531381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199.

The product of its digits is 720, while the sum is 23.

The square root of 2531381 is about 1591.0314264652. The cubic root of 2531381 is about 136.2863954618.

The spelling of 2531381 in words is "two million, five hundred thirty-one thousand, three hundred eighty-one".